21223120031022 has 128 divisors (see below), whose sum is σ = 53596041117696. Its totient is φ = 5452859647872.

The previous prime is 21223120031011. The next prime is 21223120031041. The reversal of 21223120031022 is 22013002132212.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 21223120031022.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7811973 + ... + 10172175.

It is an arithmetic number, because the mean of its divisors is an integer number (418719071232).

Almost surely, 2^{21223120031022} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21223120031022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26798020558848).

21223120031022 is an abundant number, since it is smaller than the sum of its proper divisors (32372921086674).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21223120031022 is a wasteful number, since it uses less digits than its factorization.

21223120031022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2360654.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21223120031022 its reverse (22013002132212), we get a palindrome (43236122163234).

The spelling of 21223120031022 in words is "twenty-one trillion, two hundred twenty-three billion, one hundred twenty million, thirty-one thousand, twenty-two".